Consider the reactions:${\text{X(C}}_2{\text{H}}_6\text{O)}\stackrel{\text{Cu/573K}}{\to }\text{A}$$\text{A}\stackrel{[{\text{Ag(NH}}_3{)}_2{]}^{+},{\text{OH}}^{-}}{\to }\text{Silver mirror observed}$$\text{A}\stackrel{{\text{OH}}^{-},\Delta }{\to }\text{Y}$$\text{A}\stackrel{{\text{NH}}_2{\text{NHCONH}}_2}{\to }\text{Z}$ Identify A, X, Y, and Z.

1. A
   A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z-Semicarbazide
2. B
   A-Ethanal, X-Ethanol, Y-But-2-enal, Z-Semicarbazone
3. C
   A-Ethanol, X-Acetaldehyde, Y-Butanone, Z-Hydrazone
4. D
   A-Methoxymethane, X-Ethanoic acid, Y-Acetate ion, Z-hydrazine